Dictionary.net

pertaining to the branch of astronomy dealing with the history and structure and dynamics of the universe; "cosmologic science"; "cosmological redshift"; "cosmogonic theories of the origin of the universe"

pertaining to the branch of philosophy dealing with the elements and laws and especially the characteristics of the universe such as space and time and causality; "cosmologic philosophy"; "a cosmological argument is an argument that the universe demands the admission of an adequate external cause which is God"